Strategy Based Diagnostics
- Perform the Diagnostic System Check - Vehicle before using the symptom tables.
- Review the system operations in order to familiarize yourself with the system functions. Refer to
Disassembled Views,
Engine Component Description,
Lubrication Description, and
Cylinder Deactivation (Active Fuel Management) System Description.
All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start
when repairs are necessary. For a detailed explanation, refer to
Strategy Based Diagnosis.
Visual/Physical Inspection
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
| • | Inspect for the correct oil level, proper oil viscosity, and correct filter application. |
| • | Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics. |
| • | Compare the engine sounds, if applicable, to a known good engine and make sure you are not trying to correct a normal condition. |
Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
